@article{Fischer1993,
  author    = {Eberhard Fischer},
  title     = {Taxonomic results of the Bryotrop expedition to Zaire and Rwanda : 8., Riccia vulcanicola E. Fischer (subgenus Ricciella, Sectio Cavernosae), a new species from the Virunga Volcanoes, Rwanda},
  journal   = {Tropical bryology},
  number    = {8},
  pages     = {69 -- 74},
  year      = {1993},
}